An Experimental Study on Flexural Behaviour of Geopolymer Concrete Beams

Geopolymer binders have been proved to be green building materials that can totally replace OPC by an alkaline reaction between silica and alumina are presented in source material. This paper mainly focused on the Flexural behaviour of geopolymer concrete beams with partial replacement of silica sand as natural sand at different proportions like 100:0, 90:10, 80:20, and 70:30 (natural sand: silica sand). The grade of conventional concrete was made as M40, which is equivalent to grade of geopolymer concrete. The beams were cured for 28 days at ambient room temperature and tested for two point loading. The parameters under flexural behaviour like First crack load, Ultimate load, service load, yield load, Ultimate deflection, bending stresses, Load deflection characteristics, Moment characteristics are presented. The study has given a final conclusion that at 20% replacement level of silica sand as natural sand gives better results at 8M. By increasing the replacement level decreasing the strength, hence the silica sand used as a filler material for well graded geopolymer concrete which is more sustainable.